From ProTek RC:
Adam Drake is a legend – so it’s no shock that after we determined to supply a pre-run CR21, we’d benefit from Adam’s “EBIS” engine break-in companies. Now, the identical “Oil Bathtub” break-in service trusted by Ryan Maifield, Robert Battle, Ty Tessmann Spencer Rivkin, Mike Truhe, and plenty of others is now accessible to you, carried out with the information and precision that has made The Drake a legend in RC racing.
The ProTek RC CR21 3-Port .21 Off-Highway Engine is a good possibility for any budget-conscious membership racer searching for a efficiency impressed 21 nitro engine. With a freshly designed crankshaft and light-weight piston, the CR21 can ship clean energy and crisp engine response. The engine shares the identical bore and stroke because the extremely profitable ProTek Samurai engines, selling peak engine efficiency. These options and extra offer you an engine able to excessive reliability and efficiency with out breaking the financial institution.
The CR21 nitro engine makes use of a 9-fin cooling head to take care of optimum working temperatures, and add nice seems to be. The combustion chamber is designed to advertise low to medium RPM ranges, excellent for membership racing, whereas nonetheless providing high-performance output at excessive RPM. Internally, the engine makes use of a chamfered “Knife-Edge” connecting rod that reduces reciprocating mass and will increase peak RPM. The J3-1 carburetor permits for exact tuning through the three adjustable needles. Two carburetor inserts are included (6mm – Orange and 7mm – Yellow) to help in tuning situations.
Last Run In Directions:
Warmth the engine to 180°F-200°F utilizing the ProTek R/C 12V engine heater (PTK-4050).
Prime and begin the engine. The carb has been adjusted, however it’s possible you’ll have to make slight changes relying in your gas, car, climate and elevation. General the settings will likely be very shut.
Tank #1 Let engine idle and warmth saturate for 1-2 minutes. Throughout this time you may fine-tune the idle adjustment and slowly apply the throttle to burn out any extra meeting oil. Begin working the car on the monitor or parking zone. The engine needs to be crisp on backside to mid, however nonetheless barely wealthy on prime finish. On the completion of the primary tank, let the engine cool with the piston at backside useless middle.
Tank #2 & 3 Preheat engine and proceed working on the monitor. If wanted, you may lean within the Excessive-Pace Needle one hour. On the completion of the third tank, let the engine cool with the piston at backside useless middle.
Tank #4 Preheat the engine and proceed working on the monitor. At this level, try to be near race tune with Excessive-Pace Needle barely wealthy to supply correct lubrication. The engine will proceed to enhance and acquire gas mileage within the subsequent ½ to full gallon of use. You ought to be able to go racing!
- Glorious possibility for off-road membership racers
- Damaged in by Adam Drake “Drake-In”
- Superior crankshaft design and light-weight piston ship clean crisp energy
- Black anodized 9-fin cooling head
- Features a extremely sizzling ProTek P3 turbo glow plug
- “Knife Edged” connecting rod decreases reciprocating mass whereas rising rpm
- 3-Needle J3-1 Carburetor permits for exact tuning
- Contains 6mm and 7mm carburetor venturis
Displacement: .21ci (3.49cc)
Really helpful Utility: 1/8 Off-Highway
Bore: 0.641in (16.27mm)
Stroke: 0.661in (16.80mm)
Output: 2.41hp @ 33,000RPM (2.45ps)
Sensible RPM Vary: 4,000-40,000
Weight: 13.43oz (381g)
Really helpful Exhaust:
- PTK-2060: ProTek R/C 2060 Tuned Pipe w/Manifold (PTK-2060-1: pipe solely)
- PTK-2090: ProTek R/C 2090 Tuned Pipe w/Manifold (PTK-2090-1: pipe solely)
Really helpful Glowplug:
- PTK-2542: ProTek R/C P3 Turbo Glow Plug (Extremely Sizzling)
(1) CR21 3-Port .21 Off-Highway Engine
(1) P3 “Glow Plug Turbo Glow Plug “Extremely Sizzling”
(1) Exhaust Gasket
(1) 7mm Venturi
(1) 6mm Venturi